Cannot connect to VM on port 22

[Lukas Pfeifle]

Hi all,

I enabled 4 rules on my Ubuntu 16.04 VM "sudo ufw allow 7209" and then enabled the firewall "sudo ufw enable". However i forgot to allow port 22 for my ssh connection. I can now no longer connect to my VM and i need the information on it. How can i disable the firewall without using SSH to get to the terminal.

Thanks

[Thomas Johnson]

Can you see the FW rule on the GCE console?

[Scott Van Woudenberg]

Hi Lukas,

You can connect to your VM using the interactive serial console; it doesn't use the normal network path and therefore will work even if your VM's network is down or misconfigured.

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[Faizan (Google Cloud Support)]

Hello Lukas,

One more option other than interactive serial console would be to use a startup script to disable or modify the ufw firewall. For example you can use the following startup script to add port 22 to ufw firewall on your VM. You need to restart the VM in order to run the startup script.

#! /bin/bash

ufw allow 22

I hope that helps.

Faizan

On Tuesday, September 19, 2017 at 10:44:08 AM UTC-4, Scott Van Woudenberg wrote:

Hi Lukas,

You can connect to your VM using the interactive serial console; it doesn't use the normal network path and therefore will work even if your VM's network is down or misconfigured.

On Tue, Sep 19, 2017 at 6:24 AM, Thomas Johnson <> wrote:

Can you see the FW rule on the GCE console?

On Tuesday, 19 September 2017 10:00:55 UTC-3, Lukas Pfeifle wrote:

Hi all,

I enabled 4 rules on my Ubuntu 16.04 VM "sudo ufw allow 7209" and then enabled the firewall "sudo ufw enable". However i forgot to allow port 22 for my ssh connection. I can now no longer connect to my VM and i need the information on it. How can i disable the firewall without using SSH to get to the terminal.

Thanks

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